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Vulnerability record · CVE-2026-86117 · published 5 September 2026

CVE-2026-86117: Improper authentication vulnerability

Coolify through 4.3.17 contains an authentication bypass vulnerability in the OAuth callback handler that signs users into existing accounts based solely on email address without verifying provider assertions or binding OAuth identities. Attackers can register a victim's email address on any enabled OAuth provider to obtain authenticated sessions as that user, bypassing password requirements and two-factor authentication.

9.2 CVSS 4.0 Critical EPSS 0.67% · top 49.9% CWE-287 · Improper authentication Deferred
9.2CVSS 4.0 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
10 Sep 2026Last modified by NVD

Description

Coolify through 4.3.17 contains an authentication bypass vulnerability in the OAuth callback handler that signs users into existing accounts based solely on email address without verifying provider assertions or binding OAuth identities. Attackers can register a victim's email address on any enabled OAuth provider to obtain authenticated sessions as that user, bypassing password requirements and two-factor authentication.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/coollabsio/coolify
https://github.com/coollabsio/coolify/blob/v4.3.17/app/Http/Controllers/OauthController.php
https://github.com/coollabsio/coolify/blob/v4.3.17/routes/web.php
https://github.com/geo-chen/oss/blob/main/coolify.md
https://www.vulncheck.com/advisories/coolify-through-4.3.17-oauth-account-takeover-via-unverified-email-matching

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Source: NIST National Vulnerability Database (record CVE-2026-86117), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.